Rudolf meyer



(No Model.)

R. MEYER. ROCK BORING MACHINE.

No. 558,652. Patented Apr. 21, 1896.

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RUDOLF MEYER, OF llIIILIlEIM-ON-Tl-IE-RUHR, GERMANY.

ROCK-BORING MACHINE.

SPECIFICATION forming part of Letters Patent No. Application filed February 6, 1392. Serial No. 420,515. (No model.)

To' 00% whom it may concern.-

Be it known that I, RUDOLF MEYER, of Miilheim-on-the-Ruhr, in the Kingdom of Prussia and German Empire, have invented new and useful Improvements in Rock-Borin g Machines, of which the following is a specification reference being had therein to the accom panying drawings.

A patent for this invention has been granted to me in Germany, No. 62,028, dated April 25, 1892.

This invention relates to certain new and useful improvements in rock-boring machines; and it has for its object to provide a simple, efiicient, inexpensive, and durable machine of the class described.

lVith these objects in view the invention consists in the novel features of arran gem ent and construction hereinafter described.

In the accompanying drawings, forming part of this specification, and in which like letters and figures of reference indicate corresponding parts, Figure 1 is a longitudinal section, and Fig. 2 is a transverse section, of my improved rock-drilling machine.

a is the motor-cylinder, formed with a central annular inlet-passage b for motive fluid, said inlet-passage extending entirely around the piston. The motor-cylinder is also provided with an annularseries of exhaust-openin gs 0-, arranged at equidistant points in the cylinder-wall. A piston d is designed to re ciprocate within the cylinder a. This piston (Z is provided with two sets of passages 1 and 2 alternately and symmetricallyformed in the piston, as shown in Fig. 2. The supplypassages 1 extend through the piston from the space at the rear thereof to a point on its periphery near the forward end of the piston, and the supply and exhaust passages 2 extend through the piston from the space at the forward end thereof to a point onthe periphery of the piston near the rear end thereof. As thus arranged the supply-passages 1 and supply and exhaust passages 2 are caused to alternately communicate with the annular inlet-passage Z) to admit motor fluid to each end of the cylinder. The exhaust from both sides of the cylinder takes place through the exhaust-openin gs c. When the piston is at the limit of its back stroke,

558,652, dated April 21, 1896.. Patented in Germany April 25,1892,N0.62,028.

the supply and exhaust passages 2 communicate with the exhaust-openings c, andthe motor fluid from in front of the piston passes through said passages and exhaust-opening and is allowed free exit to the atmosphere. Upon the arrival of the piston at the terminal of its back stroke the supply-passages l are brought to register with the inlet-passage b and motive fluid is admitted to the rear end of the cylinder to drive the piston forward. As the limit of its forward stroke is reached the piston uncovers the exhaustopenings 0 and the motive fluid is exhausted directly through the exhaust-openings without first passing through an intermediate passage, as is the case when the piston reaches the limit of its back stroke. In consequence of this, and owing to the fact that the use of separate distributing mechanism is avoided, greater efficiency is obtained in a simpler manner than has heretofore been possible in driHing-machines.

The drill is attached to-the outer end of the piston-rod of the piston cl in the usual manner.

A rifled bar 6, which fits in a suitable reeess in the piston, automatically effects the gradual rotation of the drill or tool during drilling by means of a ratchet (not shown) and pawls.

Should jamming of the drill occur in consequence of the automatic rotating mechanism of the same becoming hindered or interrupted by accumulation of drill-dust in the drill-holes, or by the drill striking into fissured rock, the necessary rotation of the drill can be effected by the operator by means of a handle f, secured to the end of the rifled bar 6, which extends through the end cover of the machine.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a percussive rock-drill, the combination of the motor-cylinder having an inletpassage and exhaust-passages arranged at one side of the inlet-passage, a piston Within the cylinder provided with supply-passages extending through the piston from the space in the rear thereof to a point on its periphery near its forward end, and supply and exhaust passages extending through the piston from the space in front of the piston to a point on its periphery near the opposite end of said piston, substantially as described.

2. In a percussive rock-drill, the combination of the motor-cylinder having an inletpassage and exhaust-passages arranged at one side of the supply-passages, a piston within the cylinder provided with supply-passages extending through the piston from the space in the rear thereof to a point on its periphery near its forward end, and supply and exhaust passages extending through the piston from the space in front of the piston to a point on its periphery near the opposite end of said piston, and means for imparting a step-bystep rotary motion to the piston, substantially as described.

3. In a percussive rock-drill, the combination of the motor-cylinder having an inletpassage and an annular series of equidistantly-spaced exhaust-passages at one side of the inlet-passage, a piston within the cylinder provided with two sets of alternatelyarranged and equidistantly-spaced passages, one set of which constitute supply-passages and extend through the piston from the space in the rear thereof to a point on its periphery near its forward end while the remaining set which constitute both supply and exhaust passages extend through the piston from the space in front thereof to a point on its periphery near the opposite end of said piston, and means for imparting a step-by-step rotary motion to the piston, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.v

RUDOLF MEYER.

Witnesses:

CURT FROSONG, KLINGHAMMER. 

